Yo Wildcats, let's get in the time machine and go back to East High.

OK, unfortunately time machines aren't a thing yet, but Zac Efron is doing his part to help you revel in some serious High School Musical nostalgia. The Neighbors 2 actor posted a photo of himself with his HSM co-stars Vanessa Hudgens, Ashley Tisdale and Corbin Bleu on Instagram.

Here are all the Memorial Day marathons

"So grateful I came across this picture... With the o.g. crew during one of the most cherished and exciting times of my life. Love you guys forever. #fbf," he captioned the photo from 2008 — a time when High School Musical was everywhere you looked and on the verge of heading to the big screen to complete its trilogy.

If Efron's photo has you itching to "Bop to the Top" again, you're in luck. The Disney Channel is re-airing the first movie in its most successful franchise on Monday at 4:25/3:25c as part of its Memorial Day marathon. We're all in this together with those Wildcat feels.