WATCH: Noah Wyle Guest Stars on 'Lab Rats'

WATCH: Noah Wyle Guest Stars on 'Lab Rats'

After his long tenure as Dr. John Carter, actor Noah Wyle is bringing his ER talents to an all-new holiday-themed episode of Lab Rats tonight on Disney XD.

The episode, titled "Twas the Mission Before Christmas," features Wyle in a lab coat as Dr. Evans, who offers up some light-hearted ribbing to Chase Davenport, the high-strung lead played by Billy Unger.

ET's Holiday Movie Guide

Check out the video above for a sneak peak of the "patronizing" that ensues!

Lab Rats
airs tonight at 7 p.m. ET/PT as part of Disney XD's "Winter Wonder What!? " week of holiday-themed programming.