An explosion at a wedding ceremony sends a stream of injured partygoers into New Amsterdam.

While Max and Dr. Wilder scramble to find a rare blood type to save the groom, Reynolds and Bloom treat a couple with bizarre injuries.

While helping a young girl out of a catatonic state, Iggy learns the truth about the wedding. 

Air Date: Tuesday, Oct. 4 at 10 p.m. ET/PT on NBC.

NUP_198769_00461.jpg

Picture 6 of 20

NEW AMSTERDAM -- "Big Day" Episode 503 -- Pictured: (l-r) Matthew Jeffers as Resident Mark Walsh, Janet Montgomery as Dr. Lauren Bloom -- (Photo by: Ralph Bavaro/NBC)