Icy Lake Michigan will be on “Fire” Sunday as stars of the NBC drama take a dip in the frigid waters for the Chicago Polar Plunge.

Taylor Kinney (Kelly Severide), David Eigenberg (Christopher Herrmann) and Randy Flagler (Capp) did it last year, when “The Tonight Show” host Jimmy Fallon led the charge into the bone-chilling cold bath for the Special Olympics Chicago fund-raiser.

An event spokeswoman confirmed that the trio of “Chicago Fire” stars agreed to do it again this year, when Lake Forest native Vince Vaughn will be the guest of honor.

“Chicago P.D.” star Jon Seda (Antonio Dawson) also will be back for more. This time, he’s bringing along rookie Brian Geraghty (Sean Roman).

Joining them will be real-life Chicago firefighters Tony Ferraris and Clarence Norwood, who’ve both been on the show, and director Sanford Bookstaver — not to mention a few thousand other brave souls who will go for a swim between 10 a.m. and 2 p.m. Sunday at North Avenue Beach for the 15th annual event.

Looks like “Fire’s” Charlie Barnett (Peter Mills) and Jesse Spencer (Matt Casey) are off the hook. Maybe Spencer will lend one of his plunging co-stars his hat.

"Chicago Fire" star Jesse Spencer gets pumped up before last year's plunge.

“Chicago Fire” star Jesse Spencer gets pumped up before last year’s plunge.

Taylor Kinney towels off.

A grinning David Eigenberg trails Taylor Kinney as he towels off, post-plunge.

"Chicago Fire" star Jesse Spencer (right) and co-creator Derek Haas at last year's plunge.

“Chicago Fire” star Jesse Spencer (right) and co-creator Derek Haas at last year’s event. Neither one is slated to do it again this year.

Randy Flagler (Capp), without 60-pounds of fire gear.

Randy Flagler (Capp), without 60-pounds of fire gear.

Jon Seda sports a necktie in honor of last year's VIP Jimmy Fallon.

Jon Seda sports a necktie in honor of last year’s VIP Jimmy Fallon.

Eigenberg (left) and Kinney, post-plunge.

“Chicago Fire” and “Chicago P.D.” stars get ready to run.

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Eigenberg (left) and Kinney, post-plunge.