Batman and Robin are back together.

A day after the Jets officially announced the signing of cornerback Darrelle Revis, a source confirmed Thursday that Antonio Cromartie has agreed to a four-year deal that includes a yearly base salary of $8 million.

In less than 72 hours, the Jets have retooled their secondary, turning it from one of the NFL's worst to potentially one of its best.

After two seasons in which former general manager John Idzik hoarded money at the expense of filling holes -- especially at cornerback -- the new Jets regime refused to make the same mistake. But the massive overhaul has put a huge dent in the team's salary-cap stash.

Since Tuesday, the Jets have committed $127 million to cornerbacks. First came the addition of former Brown Buster Skrine, who inked a four-year, $25-million deal Wednesday. Then came the potential coup of the offseason, prying Revis away from the Patriots with a five-year, $70-million offer with $39 million guaranteed.

And on Thursday, the Jets added the final piece, Cromartie.

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Revis said late Wednesday he planned to persuade his former teammate to come back and "join our Batman and Robin tandem we had a couple years ago.''

According to a source, Cromartie took less money to be a Jet again and reunite with Revis and his former Cardinals defensive coordinator, Todd Bowles.

"Something like a dynamic duo . . . Happy to shutdown QB's with my bro @Revis24 again!'' Cromartie tweeted, along with a picture of him and Revis.

Cromartie signed a four-year, $32-million deal in 2011. He wanted to return to the Jets last offseason, but Idzik never made an offer and Cromartie signed a one-year, $3.5-million deal with Arizona. He had three interceptions and 49 tackles and made his fourth Pro Bowl.

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The arrival of the three cornerbacks raises questions about the young corners already on the roster. With Revis, Cromartie and Skrine, that leaves former first-round pick Dee Milliner as the No. 4 corner.

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The Jets drafted Milliner ninth overall in 2013, shortly after Idzik dealt Revis to the Bucs for two draft picks. Milliner suffered a high-ankle sprain during training camp last year and missed most of the season with an Achilles tear.

Dexter McDougle is coming back after missing his rookie season with a knee injury. Idzik tried in vain to make a makeshift secondary out of backups and off-the-street signings, and cornerback Marcus Williams emerged as a solid starter.

The Jets also added another defensive back. A source confirmed they finalized a four-year deal with former Chargers strong safety Marcus Gilchrist, and he is expected to sign Friday. The 5-10, 198-pounder has five interceptions, 16 passes defensed, three forced fumbles and three sacks in 62 games (40 starts).

The Jets' secondary upgrades were a necessity, but it remains to be seen whether these moves will have a major impact on the team's success. The Jets have no clear answer at quarterback, even after this week's trade for Ryan Fitzpatrick. Their plan likely won't be known until the April draft.

Colon, Purdum re-sign. The Jets re-signed guard Willie Colon to a one-year deal for the veteran minimum plus a signing bonus, a source said. They also announced the re-signing of long snapper Tanner Purdum. According to his agent, it's a two-year deal . . . GM Mike Maccagnan, offensive coordinator Chan Gailey and several other staffers attended Oregon's pro day, featuring quarterback Marcus Mariota. The Jets also will attend West Virginia's pro day Friday.