Roger Sterling passed the Acid Test. It’s so like him.

I feel silly for not realizing there had to be an LSD episode coming in this 1966 this season of “Mad Men.” “Far Away Places,” written by Semi Chellas and Matthew Weiner and directed by exec producer Scott Hornbacher (Weiner’s right-hand man on production matters) was certainly a trip. I loved it.

I don’t recall “Mad Men” ever employing the parallel-time storyline format to this degree before. I was thrown at first, but it wasn’t hard to settle in for the ride to Lake Placid after realizing that the time loop started again once Roger and Don parted ways in front of secretary Dawn’s desk for the second time.

I liked seeing Bert Cooper reassert some of his weight around the office when he calls Don out for being on “love leave” for too long. It does seem that Don has spent precious little time on campaigns lately. Bert had that same evil-elf look in his eye as he did in the big confrontation at the end of season two when he instructs Don to essentially move on from Dick Whitman already. I suppose Roger’s LSD-fueled vision of Bert on the five-dollar bill was foreshadowing of his whip-cracking to come.

Follow @Variety on Twitter for breaking news, reviews and more